Wow, thats all I can say I am so pleased, I got this through Freecycle.

I have not tried it yet as I have only just collected it but it has an instruction book and in addition to the 4 spools of black on the machine it has 4 more brand new in a neutral colour and 4 partly used in white.

Its supposed to work, but best of all its threaded so I dont need to mess about with it for now and when I do need to change the colour I can just break the thread and attach my new colour and run it through!